Magnetically levitated motor

Abstract

A rotor includes four magnetic poles provided in a rotational direction at intervals of 90 degrees. A stator includes a winding group for rotation and a winding group for levitation. Each of the winding groups has concentrated windings spaced at intervals of 30 degrees in a rotational direction to provide induction conductive winding sections at twelve locations. Each two of the induction conductive winding sections spaced at an interval of 90 degrees among the twelve induction conductive winding sections are connected to form one winding set such that six winding sets are formed in total in each of the winding groups. Current for rotation and current for levitation are conducted through the six winding sets in the windings for rotation and levitation to perform rotation and levitation controls of the rotor.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a magnetically levitated motor that magnetically, rotationally supports a rotor in a non-contact manner.[0003] 2. Description of Related Art[0004] Conventionally, magnetic bearings that support a rotary body in a non-contact matter are used in various fields. In recent years in particular, radial magnetically levitated motors that integrate a function as a magnetic bearing and a function as a motor have been proposed. A magnetically levitated motor has an advantage in that torque generation for a rotor and positional control of a rotor shaft can be simultaneously performed.[0005] For example, a conventional magnetically levitated motor is equipped with a stator having magnetic poles formed on its inner circumferential surface in which each of the poles is wound with a single-pole winding, a rotor having M number of magnetic poles that are composed of permanent magnets and confronted with the inner circumferentia...

AI Technical Summary

Benefits of technology

The present invention provides a magnetically levitated motor with a simplified stator structure and a simplified control that avoids one of magnetic levitation force control and rotational torque control from affecting the other. The motor has a high efficiency and can accommodate very high-speed rotations. The motor includes a stator with windings for rotation and windings for levitation, and a rotor magnetized in multiple poles. The motor has a driving frequency reduced by half compared to a motor with a rotor magnet having eight magnetic poles and a winding having six poles. The motor can be formed in a planar or cylindrical-confronting configuration, and a driving amplifier with a greater speed is not necessary. The motor is efficient and effective in driving the rotor.

Problems solved by technology

However, the conventional magnetically levitated motor described above requires a complex magnetic flux distribution for the stator, which results in a complex structure, and complex levitation force control is required.

Accordingly, it is difficult for the motor to increase the motor speed, and there is a problem in that the levitation force is weak and therefore its efficiency is unsatisfactory.

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